Cushion spring assembly



OCL 8, 1935- w.' E. wuNDERLlcH CUSHION SPRING ASSEMBLY Filed May 2'7,A 1932 2 Sheets-Sheet 1l 0d 8, 1935- w. E. wUNDERLlcH CUSHION SPRING ASSEMBLY Filed May 27, 1932 2 Sheets-*Sheet 2 Patented Oct. 1935 UNITED STATES PATENT oEFlcE n2,017,032 cUsnroN. SPRING ASSEMBLY William E. Wunderlich, Muncie; Ind., assignor to The Moore Company, Muncie, Ind., a corporation of Indiana Application May 27, 1932, serial No. 613,959

z claims. (cl. s-zso) This invention relates to coil springs more par ticularly for cushion spring structures.

The invention is particularly adapted for use in connection with inner spring mattresses for beds .and other)` furniture.

Among other objects, the invention aims to provide an improved cushion spring structure -witha substantially square edge and substantially straight side and end margins. Another object of the invention is to 'provide a spring structure Figure 2 is an elevational viewof one form of coil spring embodying Amy inventionand isa view taken on the line 22 oi.' Figure 1.

Figures 3, 4, and 5 are separated views of indi- 25 vidual springs shown in the structure of Figure 1,

Figure 3 being a perspective view oi a preferred form of corner spring included in my invention,

Figure 4 being ,a perspective view of a preferred form of end spring'included in my invention, and

30 Figure 5 being a perspective view ofa preferred the spring I as a whole as dened by a vertical line.

passing through the centers of the convolutions 2 and 3. In this instance, the axis of this barrel 45 portion is shown offset from said'cent'er lin'e toward the edge of the assembly, which as shown in Figure 2, is toward the left of the spring I, which is one of the marginal springs of the assembly..

This results in illling out and supporting the edge 50 oi the assembly, a portion of which is illustrated in Figure 1, so as to guard against sagging of the margins of the assembly. As`shown in the drawings, the barrel portions of the springs are approximately one-half of the greatest diameter of 55 `the terminal convolutions, thus enhancing the resiliency between the axis' of the`terminal conl volutions and the margin of the assembly. 'A Furthermore, I have shown the helical convolutions of the barrel. portion 4 of substantially the same diameter so that each extends out to a '5 common vertical plane represented by the line A (Figure 2) which is closely adjacent to a plane passing through the edge of the assembly as a whole. In other words, the line A is in a plane spaced inwardly from a plane tangent to the 10 terminal convolutions at their margin bordering the edge of the assembly by substantially the thickness of tne material of the terminal convolutions. Thus not only is the edge supported Y and reinforced, but it is desirably iilled out, so

that a fabric 'covering material, for example, in

which the spring structure'is commonly enveloped, will be maintained smooth across the edge of the assembly and an undesirable concave convolution of the edge, which is highly detrimental to an at.. tractive inner spring mattress, is avoided. To avoid clicking or chattering of the springs, it is not desirable that the barrel portion 4 extend out flush-with the terminal convolutions 2 and 3 since ,these terminal convolutions should be, permitted to pass the adjacent convolution of the barrel por.- tion 4, should the springs be compressed suflciently to bring either terminal convolution into a the same plane as the adjacent convolution of the barrel portion, but I have shown them extending almost ilush so that they may still pass each other and yet produce the square edge effect described. The spring assembly illustrated in Figure 1 may also `advantageously include a corner coil spring 5 having a barrel 6 constructed similarly 35 to the barrel 4 and extending out toward the corner of the assembly to be substantially flush with rounded corner portions 1 providing arcuate portions of fully ninety degrees on the upper and lower convolutions 8 and 9, respectively,` ofthe 40 corner coil spring 5. I y

Similarly, an end coilspring I0 may have a barrel portion II similar to the barrel portions -4 and 6 and extending out-to be substantially flush with the end margin I2 of the assembly. 45 The assembly may also include conventional interior springs, such as'the coil ispring I3.

Springs, such as the spring I`, here represented as locatedrat a side margin I4 of the assembly,

desirably have elongated substantially straight l portions I5 extending alongl the side margin oi the assembly and having threaded thereabout a connecting spring I8 of small diameter.

End springs, such as the spring III. also have an elongated straight portion I'I extending along 55 the end margin I2 of the assembly and having threaded thereabout a connecting spring I8 similar to the connector I6. These portions I1 are desirably as long or longer. than a diameter 5 of the terminal convolutions of the spring I0.

It will be understood that said elongated portions I5 and I1 of the springs I and ID, for example, are not only on the upper convolutions of these springs, but also on the lower convolutions, and in the case of the end springs I0, I have provided shorter substantially straight offset portions I9 and 20 on the upper and lower ter- ,Yminal convolutions 2| and 22, respectively, of

"the end spring I0. These offsets are duplicated 5 on each terminal convolution, so that there are four offsets on each spring I0 and the offsets I9 on the upper convolution are staggered with respect to each other, while the oisets 20 on the lower convolution are also staggered with respect'to each other. Similarly, a pair of offsets I9 and 20 are also staggered with respect to each other. The offsets of each pair I9 and 20 are aligned and are substantially perpendicular with the straight elongated portions I1 and one of the offsets 20, togetherwith one of the offsets I9 is immediately adjacent to the elongated portion I1.

Similarly, the upper convolution 8 of the corner coil spring 5 and the lower convolution 9 of the corner coil 5 have staggered offsets 23 and 24, respectively, which are adapted to be aligned with one each of a pair of offsets I9 and 20 of the coil spring I 0. Thus a connecting spring may be threaded about the oiset 23 of the corner coil 5 and an offset I9 of the end coil I0. Also a connecting spring 26 at thebottom of the assembly and in the same vertical plane as the connecting spring 25 is threaded about the offset 24 of the corner coil 5 and an oiset 20 of the end coil IIJ. Thus one of the connecting springs in this plane extends substantially to the end margin I2 of the assembly,'and, in said plane three of the offsets,.such as the oiset 2 one of the oisets I9 and one of the offsets gjoc'cur 45 successively. This construction greatly s engthens the corner of the coil, particularly at the end margins, and oers enhanced resistance to distortion of the assembly as a whole and particularly'of the corners of the assembly, which are most apt to break down.

Furthermore, the elongated portion I1 of the end springs I0 is desirably elongated to such an extent Athat a relatively small gap is left, for example, at 21 between the end springs I0, thus enhancing the strength and appearance of the square end margins.

The marginal connecting springs I8 and I6 desirably engage relatively short oisets 28 on the corner springs`5 which serve to anchor the connecting springs thereto to guard against objectionable relative movement, thus preventing distortion and chattering.

By bringing the barrels, as well as the other parts mentioned, substantially out to the margin of the assembly and providing rectilinear lines wherever possible (except, at the corners where round lines are desirable) I provide a spring structure of enhanced strength and attractiveness. 5

Referring to the perspective views of the individual springs as shown in Figures 3, 4, and 5. it will be noted that the offset barrel portions 4, 6, and II of the individual springs I,` 5, and I0 being o f a reduced radius with respect to the 10 terminal convolutions of the respective springs and eccentric therewith produce a relatively sharp bend in the terminal convolutions which provides an anchorage for the knotted ends 29 of the terminal convolutions which are wrapped 15 around this portion of the spring material. This minimizes `slippage of the knot 29 and to further guard against this, the material of the spring may be slightly kinked as at 30 in the vicinity of the knot 29.

1. In a cushion spring assembly, the combination including a plurality of upright parallel coil springs arranged abreast along the margin of the assembly, each coil spring having enlarged y2:5 upper and lower terminal convolutions and a plurality of reduced intermediate convolutions of substantially uniform diameter, said intermediate convolutions being vertically aligned and having their common axis offset from the principal s0 axis of the terminal convolutions toward the margin of the assembly, whereby the margin of the assembly is lled out and reinforced while the said terminal convolutions extend inwardly of the spring assembly to a point laterally offset 35 and materially spaced from the said intermediate convolutions.

2. In a cushion spring assembly, the combination including a plurality of upright parallel coil springs arranged abreast along the margin of 40 the assembly, each coil spring having enlarged upper and lower closed terminal convolutions and a plurality of reduced intermediate convolutions of substantially uniform diameter, said intermediate convolutions being verticallyA aligned and having their Acommon axis offset from the axis of the terminal convolutions toward the margin of the assembly, an elongated portion on each of the upper and lower terminal convolutions extending in the direction of said margin slightly 5.0, offset laterally outwardly of the assembly and said intermediate convolutions, and a light helical connecting spring threaded onto the elongated portions of "upper and lower terminal convolu^ tions respectively, there being two of said con- 5.5 necting springs in a vertical plane substantially u tangent to al1 of said intermediate convolutions, whereby the margin of the assembly is illled out and reinforced while the said terminal convolutions extend inwardly of the spring assembly to a point laterally offset and materially spaced from the said intermediate convolutions. 

